Bead-building apparatus



2 6, 1938., J SHOOK v 2,115,450

BEAD BUILDING APPARATUS Filed Aug. 21, 1935 INVENTOR FLORA/N J? .5H00K ATTORNEY Patented Apr. 26, 1938 PATENT OFFICE BEAD-BUILD'IN G APPARATUS Florain J. Shook, Akron, Ohio, assignor to National- Standard Company, Niles, Mich., a corporation of Michigan Application August 21, 1935, Serial No. 37,213

Claims.

f This invention relates to bead-building appav ratus employed in' the manufacture of endless,

laminated, rubberized bead cores or. rings for pneumatic tire casings, and more especially it 5 relates to rotatable forms upon which the beadbuilding material, in the form of a tape, is wound.

The invention is an improvement upon the bead-building form shown in my copending application for Letters Patent, Serial No. 728,557, now Patent No. 2,080,013 of May 11, 1937 and is especially applicable for use with the machine shown in that application. In its broader aspects, however, the invention is applicable to bead-building'forms generally.

The chief objects of the invention are to facilitate the removal of a finished bead core from the form on which it is built; and to provide a collapsible bead-building form wherein the form is expanded to greatest circumferenceconcurrently with the gripping of the leading end of a beadbuilding tape, at the start of a bead winding operation, and collapsed to reduced circumference concurrently with the release of the leading end of said tape, immediately prior to the ejection of the finished bead core from the form. More specifically the invention aims to provide a workgripper and form-expander in a single structure operable by a single power-applying member. Other objects will be manifest.

Of the accompanying drawing,

Figure 1 is a fragmentary front elevation of a bead-building form embodying the invention, in its preferred form,'in its expanded or operative position, and the work thereon;

Figure 2 is a similar view showing the iniproved form in its collapsed position, prior to the ejection of the work therefrom; and

Figure 3 is a section on the line 33 of Figure 1.

Referring to the drawing, l0 designates generally a disc-like bead-building form with the usual circular perimeter upon which a bead core is built. The latter, shown complete at II, Figure 2, is composed of a plurality of convolutions of a rubberized, woven wire tape l2 that is drawn from a suitable source of supply (not shown) and wrapped about the form by reason of the rotation of the latter, the convolutions of tape being com- 50 pacted on the form by means of a presser roller l3 under which the tape is drawn and which is yieldingly urged toward the periphery of the form. The form In is rotated by means of the axial shaft or spindle l4, said form being secured to a hub (not shown) by means of cap screws l5, I5, and said hub keyed to said shaft 14.

The illustrative form It as shown consists of two parts, one of which is a chordal segment H) of relatively small area as compared to the remainder of the form. In the normal operative position of the form shown in Figure 1, the seg' ment Ill is separated fromthe major section of the form by a chordal slot llithat is closed at one end, adjacent the perimeter of the form, and at its opposite 'end opens into a larger non-radial recess'or slot IS in the perimeter of the form. The segment 10 is provided near one of its ends with a pair of parallel spaced-apartears, such as the ears l9, which ears span the slot 51 near the closed end of the latter and are pivotally connected to the major form-section at 20. A second pair of ears, such as the ears 2!, are formed on the segment Ill near the middle thereof and extend across slot IT to embrace the major form section, thereby imparting lateral stability to the pivotal segment Ill. The arrangement is such that the segment H] has limitedangular movement about the pivot 28, which movement is limited in the expanding of the form by the metal at the closed end of the slot ll, the collapsing movement of the segment being limited to the width of the slot I! at the open end thereof. The width of slot i! need not be more than one-eighth inch, this distance permitting sufficient movement of the segment ill to pull the latter free of the work I l on its peripheral face, during collapsing of the form. A tension spring 22 connected at its opposite ends to studs 23, 24 project ing from the segment Ill and the major formsection respectively normally urges the said segment toward collapsed position. a

Means for moving the segment Id outwardly, aganist the tension of spring 22, to bring the form to its normal operative circumference, is provided by effecting a modification of the clamp or gripper that is utilized for clamping the leading end of the tape I2 to the form, within the recess IS, without altering or modifying the work-clamping functions of said gripper. Said clamp or, gripper comprises a front gripper arm 26 and parallel rear gripper arm 21, which arms are arranged upon opposite sides of the major form-section, and secured to opposite end portions of a pivot pin 28 that is journaled in the latter. The free ends of arms 26, 21 span the recess [8 in the perimeter of the form, and are connected by and support a renewable hardened metal pin 29 of polygonal cross section, and a cylindrical roller 30 that is journaled at its respective end portions being supported upon and in said arms.

Both pin 29 and roller 30 are disposed within the recess 18, said pin being so positioned as to engage the leading, end of {the tape 1 land to clamp the same againstthe bottom of ,the'recess 18, when the mechanism is in the ;operative position shown in Figure 1. The roller isso positioned'that it 'supports'the'segment a HI in spaced relation to;the major form section, l V f against the tension of spring 22,,in theoperative position'of the mechanism shown in Figure '1. When the arms 26, 1 21 are moved angularly to I the position shown in Figure:2, the pin 29 is lifted fromthe leading end'of the-tape I2, and; the roller h P 30xis so disposedjas to permit the spring 22 to collapse the form by, movingthe segment {I 0,? about its -pivot 20"until its free end rests'upon the chordal margin of the major form-section.

. The arms 26, '21 are identicalexce'pt .thatarm1 26 is :formed with an oppositely extending' lever; arm 2 6? that has its free end pivotally connected latter being pivotally connected to a,;pin"33;lthat extends from the rear of the form through'a' slot therein. The rearend'of pin 335carries a'cam roller 35, that rides upon the perimeter of i a camstructure 36 that is -j ournaledyupon;;the

E'shaft L4 rearwardly of, the'form [O The cam-v3fi is formed with a single depression 38 that is abrupt on'one side and sloped onfthesothen side,

and during the windingof-a bead core, while the; form I 0 is rotating:in -the direction': indicated a why the arrow in liigure' 1 tl;1e cam roller is positioned, in said qdepressionflfi ,heingurged thereinto by a tension spring 3! thaois connested te'link 32 and to a fixed point onthe form Iil;;in..which position of the parts the clamping pints is in engagement with the-leading end of 1 tape'i2 and the form is in the-expanded position shown'inF'igure 1', During the intervals that the ,formlll-is stiationary, the cam 36 is moved rela itivelyiof the form lfland hub l4, counterclookwise as viewed in the drawing, to gnove the link- 32 longitudinally'ag'ainst the tension offspring 1 31 and thereby to'rnovethe.arrnsg26,;2]{angu larly to cause gripper pin 29 .to release the endof tape l2 and'roller' 30 to movertothe' position shown in Figure 2, thus permitting spring 22 to pull segment 0 'to collapsed position; '-;Meansfor so moving the cam 36'formsfno part'of; the ,present invention, 'butis shown and described I in my copending application hereinbefore'mem;

. tioned. j

"foregoing statement ofobjects.

The mechanism described will concurrently release the leading 'end of tape |2-andjcol1apse the form to smaller circumference so that; the

I finished bead H is easily removed fromrthe' forms The invention is simple andeffectivegand-ac complishes the several objects {set outf in the I Modifications m'ay be resorted to :without'fde parting from the spirit of the inven' fon or the scope'of the appended claims. j

What is claimed is: 7' s '1. A beadbuilding form comprising a circular, disc-like structure, including. ,a fixed major: segment and a chordal segmentpivotally connected to saidymajor;segment;at one of itsends and normally spaced from said major segment when' the form is expanded tooperative circumference, and means at the'free end of the chordal segment for, rocking it on its pivotto expand and contractthe form, said last-mentioned means including means for engaging and releasing the leading end'of a strip' of bead-building material onthe margin of the form.

2Q A rotatable bead-building form comprising a circular disc-like structure, including a fixed ma'jor segment anda chordal segment movable V Y "relatively thereto, an arm pivotally mounted a upon'the fixed segment and angularly movable during intervals that the form is stationary;

means on said arm engaging the chordal segment upon the fixed segment and angularly movable means on said arm extending laterally, between said segments for moving the chordal segment relatively of the fixed segment, and means on said arm for engaging the leading end of 'a strip of segment toward thefixed segment, an arm pivotallyf mounted on'the fixed segment and angularly movable during intervals that the form is stationary, means on said, arm engaging the chordal 7 segment at the free end thereof for V 7 moving said chordal segment pivotally, and means on said arm for engaging the leading endof a strip of bead-buildingmaterial tohold the same 7 against thechordal margin of the fixed segment."

7 5. A rotatable bead-building form comprising; T 'acircular, disc-likestructure including a fixed, 7 major segment and a chordal. segment hingedly' 30 bead-building material tohold the same against the chordal margin of the fixed'segment. -5

4. Airotatable bead-building form comprising 'I 'a circular, disc-like structure, including a fixed;

major segment and a chordal segment pivotally connected at one of its; ends to the' fixe'd s'eg; ment, there being a chordal slot sbetween, said segments, means normally" urging the chordal connectedat one of its ends to the fixed segment, there being a chordal slot between the larger, non-radial recess formed in the margin ofthe form; y'ieldingmear'is'normally urging the segments that is closed' at its end adjacent said I hinge and at its opposite end merges with a j chordal segmentto'ward. the fixedsegment, an

' arm pivotally mounted onthe fixed segment and angularly movable when therform is stationary,

' means on said arm extending intosaid non-radial recess and engaging a margin of thechordal segment, for moving the latter angularly' on'its' hinge, and means" on said arm extending into f said non-radial recess adapted toclamp the lead ing end of a strip of bead-building material tothe chordal margin ELORAIN J. SHOOK."

of the fixed segment. 

